Seems to me to mean that interest.co.nz's definition of recent is different from mine in that the change occured nearly two years ago.
I've only become interested in Bonds recently, as an alternative to TDs, because while TD rates are high at the moment they can quickly come down again whereas bonds are fixed atleast for a number of years.
Also if one took a long-term TD to lock-in the rate and then wanted the money sooner one would have to ask nicely (grovel) and still might be refused.
A bond preserves access, at the risk of some loss of capital.